EP0293599B1 - Method of recapping tyres - Google Patents

Method of recapping tyres Download PDF

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Publication number
EP0293599B1
EP0293599B1 EP88106805A EP88106805A EP0293599B1 EP 0293599 B1 EP0293599 B1 EP 0293599B1 EP 88106805 A EP88106805 A EP 88106805A EP 88106805 A EP88106805 A EP 88106805A EP 0293599 B1 EP0293599 B1 EP 0293599B1
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EP
European Patent Office
Prior art keywords
plies
belt ply
belt
tire
vulcanised
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP88106805A
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German (de)
French (fr)
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EP0293599A3 (en
EP0293599A2 (en
Inventor
Peter Dr. Entmayr
Manfred Reppin
Werner Küster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental AG
Original Assignee
Continental AG
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6329035&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0293599(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Continental AG filed Critical Continental AG
Priority to AT88106805T priority Critical patent/ATE86183T1/en
Publication of EP0293599A2 publication Critical patent/EP0293599A2/en
Publication of EP0293599A3 publication Critical patent/EP0293599A3/en
Application granted granted Critical
Publication of EP0293599B1 publication Critical patent/EP0293599B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/54—Retreading
    • B29D30/56—Retreading with prevulcanised tread

Definitions

  • the invention relates to a method for tire tread and partial belt renewal of pneumatic vehicle tires, wherein optionally the belt layer (s) and then the fully vulcanized, profiled tread is first placed on the tire body with the interposition of binder layers, and then pressure treatment is carried out, if appropriate at elevated temperature.
  • the process which is often known as the cold-soling process, has the great advantage that the finished tire body can be provided with a rubber sleeve surrounding it for the purpose of the final treatment in an autoclave.
  • the inner pressure in the tire and the pressure in the autoclave then result in a secure binding of the previously vulcanized, treaded tire at elevated temperature.
  • a retreading process with partial belt renewal is known from French patent application 77 07664, where the tread is optionally vulcanized before or after being put on and the new belt plies are put on in the uncured state.
  • a corset is required when creating the connections between the layers.
  • this corset does not act as a device on the outer circumference of the tire but as a tire component in the middle of the tire itself.
  • a spiral made of rigid reinforcements on the last un-renewed carcass or belt layer is provided.
  • the invention has for its object to provide a retreading process with partial belt renewal that with a comparatively short vulcanization or treatment time in the autoclave on growth-limiting devices such.
  • the belt layers to be put on are vulcanized based on the invention so that deformations and changes in position of the reinforcement layers are excluded. At least a preliminary vulcanization must therefore be carried out with the aim of achieving a sufficient dimensional stability of the envelope rubber for the reinforcement of the belt.
  • the tire can be finished treated without an additional steel bandage; it is sufficient to use a simple rubber sleeve.
  • the tire body consists of rubber or rubber-like substances. It is solidified by several reinforcement inserts.
  • the actual tire body 1 is solidified by a carcass, not shown, which is anchored in the bead portion 2 by looping around the tire cores 3.
  • the tire body 1 intended for the sole has only two superimposed belt layers 4, 5 above its carcass.
  • the outer surface of this partial belt and the shoulder surfaces 6 of the tire body 1 located on both sides thereof are removed after the worn or damaged tire parts located above have been removed , roughened or otherwise prepared for the further procedure.
  • a steel adhesive pad 7 is placed on the zenith of this tire body, which is prepared by admixing accelerators and the like so that it can be vulcanized comparatively quickly.
  • the cushion plate 7 serves as a base for the newly applied belt plies 8, 9, each of which consists of a layer of thin wire cables arranged in a cord position, which are embedded in rubber, so that two rubberized steel cable layers are created with the opposite increase in their steel cables.
  • the two belt layers 8, 9 are then covered with a thin binding plate 10 made of unvulcanized rubber.
  • This rubber sheet is also designed so that it vulcanises comparatively quickly.
  • This binding plate 10, which also compensates for the individual unevenness, is now provided with the fully vulcanized, profiled tread strip 11.
  • the tire thus constructed is now provided with a rubber bandage, but is additionally placed on a rim and inflated before being placed in an autoclave.
  • the treatment in autoclaving achieves the advantageous pressure treatment, but at the same time generates the temperature between 100 and 150 ° C. required for vulcanization. It is not necessary to provide the tire body constructed according to the figure with a steel bandage which surrounds it in particular; the strength members of the belt layers 8 and 9 do not change their desired angular position because the rubber enveloping them had been vulcanized before the two belt layers 8, 9 were put on.
  • the process according to the invention has the great advantage that the treatment in the autoclave can be carried out comparatively quickly because the rubber for the two belt layers 8, 9 was no longer too vulcanised.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Tyre Moulding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The method involves initially applying the belt ply (plies) and then the ready-vulcanised, profiled tread rubber to the body of the tyre, if appropriate with interposed layers of binding agent and the use of coatings, and then carrying out pressure treatment, if appropriate at elevated temperature. In order to be able to dispense with steel collars with a comparatively short vulcanising or treating time in the autoclave, it is proposed that the belt plies are vulcanised before they are laid. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Laufstreifen-und Teilgürtelerneuerung von Fahrzeugluftreifen, wobei gegebenenfalls unter Zwischenlegen von Bindemittelschichten zunächst die Gürtellage(n) und dann der fertig vulkanisierte, profilierte Laufstreifen auf den Reifenkörper aufgelegt wird und dann eine Druckbehandlung gegebenenfalls bei erhöhter Temperatur erfolgt.The invention relates to a method for tire tread and partial belt renewal of pneumatic vehicle tires, wherein optionally the belt layer (s) and then the fully vulcanized, profiled tread is first placed on the tire body with the interposition of binder layers, and then pressure treatment is carried out, if appropriate at elevated temperature.

Für den Fall, daß eine Teilgürtelerneuerung nicht erforderlich ist, hat das oft als Kaltbesohlungsverfahren bekannte Verfahren den großen Vorteil, daß zum Zwecke der Endbehandlung in einem Autoklaven der fertig belegte Reifenkörper mit einer ihn umgebenden Gummimanschette versehen werden kann. Durch den Reifeninnendruck und den im Autoklaven herrschenden Druck ergibt sich dann bei erhöhter Temperatur eine sichere Bindung des vorher vulkanisierten, fertig profilierten Laufstreifens.In the event that a partial belt renewal is not required, the process, which is often known as the cold-soling process, has the great advantage that the finished tire body can be provided with a rubber sleeve surrounding it for the purpose of the final treatment in an autoclave. The inner pressure in the tire and the pressure in the autoclave then result in a secure binding of the previously vulcanized, treaded tire at elevated temperature.

Für den Fall jedoch, daß auch eine oder mehrere Gürtellagen erneuert werden müssen, kann dieses einfache Verfahren nicht mehr ausgeübt werden. Der fertig belegte Reifen muß unter diesen Voraussetzungen vielmehr mit einer Stahlbandage umschlossen werden, um z.B. unerwünschte Verwerfungen der Gürtelfestigkeitsträger z.B. Winkelveränderungen auszuschalten.However, in the event that one or more belt layers also have to be replaced, this simple procedure can no longer be carried out. Under these conditions, the finished tire must rather be enclosed with a steel bandage, in order, for example, to prevent undesirable warping of the belt strength members, for example changes in angle.

Aus der EP-A-0 189 826 ist ein solches Runderneuerungsverfahren mit Teilgürtelerneuerung bekannt, das eine Stahlmanschette erfordert, die von außen am Reifenumfang angreifend das Durchmesserwachstum der neu aufgelegten Reifenteile begrenzt. Diese als Korsett wirkende Stahlmanschette ist erforderlich bis die Festigkeit des Reifens wiederhergestellt ist. Die Stahlbandage ist als Fixierung für die noch nicht durchmesserbegrenzend wirkenden, neu aufgelegten Gürtellagen erforderlich.Such a retreading method with partial belt renewal is known from EP-A-0 189 826, which requires a steel collar which, from outside the tire circumference, limits the growth in diameter of the newly placed tire parts. This steel cuff, which acts as a corset, is required until the strength of the tire is restored. The steel bandage is required as a fixation for the belt layers that have not yet been used to limit the diameter.

Aus der französischen Patentanmeldung 77 07664 ist ein Runderneuerungsverfahren mit Teilgürtelerneuerung bekannt, wo der Laufstreifen wahlweise vor oder nach dem Auflegen vulkanisiert wird und die neuen Gürtellagen in unvulkanisierten Zustand aufgelegt werden. Auch hier ist ein Korsett bei der Erstellung der Verbindungen der Lagen untereinander erforderlich. Im Gegensatz zum vorangenannten Stand der Technik greift dieses Korsett nicht als Vorrichtung am äußeren Reifenumfang sondern als Reifenbauteil inmitten des Reifens selbst an. Als Korsett ist hier eine Spirale aus zugsteifen Festigkeitsträgern auf der letzten unerneuerten Karkaß- bzw. Gürtellage vorgesehen.A retreading process with partial belt renewal is known from French patent application 77 07664, where the tread is optionally vulcanized before or after being put on and the new belt plies are put on in the uncured state. Here, too, a corset is required when creating the connections between the layers. In contrast to the aforementioned prior art, this corset does not act as a device on the outer circumference of the tire but as a tire component in the middle of the tire itself. As a corset, a spiral made of rigid reinforcements on the last un-renewed carcass or belt layer is provided.

Aus der europäischen Patentanmeldung 0 047 711 ist schließlich ein weiteres Runderneuerungsverfahren zur Teilgürtelerneuerung bekannt, wo ebenfalls durch ein Korsett das Durchmesserwachstum des rundzuerneuernden Reifens bei der zur Herstellung der Lagenverbindungen erforderlichen Druckbehandlung begrenzt wird. Auch hier ist ein solches Korsett erforderlich, um Verwerfungen und Lageveränderungen der Festigkeitsträgerlagen auszuschließen. Im Gegensatz zu den vorangenannten Entgegenhaltungen ist hier das Korsett noch weiter radial innen angeordnet, nämlich innerhalb des Blähbalges. Durch Anordnung einer Lage mit in Umfangsrichtung verlaufenden Festigkeitsträgern im Zenit des Blähbalges ist nach Straffung dieser Festigkeitsträger zumindest im Zenit praktisch kein weiteres Wachstum der Vorrichtung und damit des rundzuerneuernden Reifens mehr möglich.From European patent application 0 047 711, finally, another retreading method for partial belt renewal is known, where the diameter increase of the retreaded tire in the pressure treatment required to produce the ply connections is likewise limited by a corset. Such a corset is also required here to prevent warping and changes in the position of the reinforcement layers. In contrast to the aforementioned documents, the corset is arranged even further radially inside, namely within the Inflatable bellows. By arranging a layer with reinforcements running in the circumferential direction in the zenith of the inflation bellows, after tightening these reinforcements, practically no further growth of the device and thus of the tire to be retreaded is possible at least in the zenith.

Der Erfindung liegt die Aufgabe zugrunde, ein Runderneuerungsverfahren mit Teilgürtelerneuerung anzugeben, daß bei einer vergleichsweise kurzen Vulkanisier- bzw. Behandlungzeit im Autoklaven auf wachstumsbegrenzende Vorrichtungen, wie z. B. die erwähnten Stahlmanschetten, und zusätzliche Reifenbauteile verzichtet werden kann.The invention has for its object to provide a retreading process with partial belt renewal that with a comparatively short vulcanization or treatment time in the autoclave on growth-limiting devices such. B. the mentioned steel sleeves, and additional tire components can be omitted.

Zur Lösung dieser Aufgabe werden aufgrund der Erfindung die aufzulegenden Gürtellagen vor dem Auflegen so vulkanisiert, daß allein hierdurch Verformungen und Lageveränderungen der Festigkeitsträgerlagen ausgeschlossen sind. Es muß also zumindest ein Vorvulkanisieren vollzogen werden mit dem Ziel, eine ausreichende Formsteifigkeit des Hüllgummis für die Festigkeitsträger des Gürtels herbeizuführen.To achieve this object, the belt layers to be put on are vulcanized based on the invention so that deformations and changes in position of the reinforcement layers are excluded. At least a preliminary vulcanization must therefore be carried out with the aim of achieving a sufficient dimensional stability of the envelope rubber for the reinforcement of the belt.

Unter diesen Voraussetzungen kann das Fertigbehandeln des Reifens unter Verzicht auf eine zusätzliche Stahlbandage geschehen; es ist ausreichend, eine einfache Gummimanschette zu benutzen.Under these conditions, the tire can be finished treated without an additional steel bandage; it is sufficient to use a simple rubber sleeve.

Eine unerwünschte Verwerfung der Festigkeitsträger der neu aufgelegten Gürtellagen ist deshalb ausgeschlossen, weil die Festigkeitsträger durch den schon in ausreichender Weise ausgehärteten Hüllstoff an unerwünschten Lageveränderungen gehindert sind.An undesirable warping of the reinforcement of the newly laid-on belt layers is therefore excluded because the reinforcement is prevented from undesirable changes in position by the envelope material which has already hardened sufficiently.

Weitere Einzelheiten der Erfindung werden anhand der Zeichnung erläutert, die zur Beschreibung des erfindungsgemäßen Verfahrens dienen soll.

Die Abb.
zeigt in schaubildlicher Teildarstellung die auf den kalt zu besohlenden Reifenkörper aufzubringenden Schichten.
Further details of the invention are based on the Drawing explained, which is intended to describe the method according to the invention.
The fig.
shows a diagrammatic partial representation of the layers to be applied to the cold-soled tire body.

In üblicher Weise besteht der Reifenkörper aus Gummi oder gummiähnlichen Stoffen. Er ist durch mehrere Verstärkungseinlagen verfestigt.In the usual way, the tire body consists of rubber or rubber-like substances. It is solidified by several reinforcement inserts.

Der eigentliche Reifenkörper 1 wird durch eine nicht näher dargestellte Karkasse verfestigt, die in der Wulstpartie 2 durch Umschlingen der Reifenkerne 3 verankert ist.The actual tire body 1 is solidified by a carcass, not shown, which is anchored in the bead portion 2 by looping around the tire cores 3.

Der für die Besohlung vorgesehene Reifenkörper 1 hat oberhalb seiner Karkasse nur noch zwei übereinanderliegende Gürtellagen 4, 5. Die Außenfläche dieses Teilgürtels und die zu beiden Seiten davon befindlichen Schulterflächen 6 des Reifenkörpers 1 werden, nachdem die abgefahrenen oder beschädigten, darüber befindlichen Reifenteile entfernt worden sind, aufgerauht oder in sonstiger Weise für das weitere Verfahren vorbereitet. Alsdann wird auf den Zenit dieses Reifenkörpers eine stahlhaftende Polsterplatte 7 aufgelegt, die durch Beimischung von Beschleunigern und dergl. so vorbereitet ist, daß sie vergleichsweise schnell vulkanisierbar ist. Die Polsterplatte 7 dient als Unterlage für die neu aufzubringenden Gürtellagen 8, 9 die je aus in einer Lage angeordneten, in Cordlage befindlichen dünnen Drahtseilen bestehen, welche in Gummi eingebettet sind, so daß somit zwei gummierte Stahlseillagen entstehen mit gegenläufigem Anstieg ihrer Stahlseile.The tire body 1 intended for the sole has only two superimposed belt layers 4, 5 above its carcass. The outer surface of this partial belt and the shoulder surfaces 6 of the tire body 1 located on both sides thereof are removed after the worn or damaged tire parts located above have been removed , roughened or otherwise prepared for the further procedure. Then a steel adhesive pad 7 is placed on the zenith of this tire body, which is prepared by admixing accelerators and the like so that it can be vulcanized comparatively quickly. The cushion plate 7 serves as a base for the newly applied belt plies 8, 9, each of which consists of a layer of thin wire cables arranged in a cord position, which are embedded in rubber, so that two rubberized steel cable layers are created with the opposite increase in their steel cables.

Wichtig ist nun, daß die beiden Gürtellagen 8, 9 vor dem Auflegen auf die Polsterplatte 7 vulkanisiert worden sind, der die einzelnen Festigkeitsträger umschließende Hüllgummi somit nicht mehr plastisch, sondern derart elastisch ist, daß Winkelveränderungen der einzelnen Festigkeitsträger nicht mehr ohne weiteres möglich sind.It is now important that the two belt plies 8, 9 have been vulcanized before being placed on the cushion plate 7, so that the enveloping rubber surrounding the individual strength members is no longer plastic, but is so elastic that angle changes of the individual strength members are no longer possible.

Die beiden Gürtellagen 8, 9 werden dann mit einer dünnen Bindeplatte 10 aus unvulkanisiertem Gummi belegt. Auch diese Gummiplatte ist so beschaffen, daß sie vergleichsweise schnell ausvulkanisiert. Diese auch die einzelnen Unebenheiten ausgleichende Bindeplatte 10 wird nun mit dem fertig vulkanisierten, profilierten Laufstreifen 11 versehen.The two belt layers 8, 9 are then covered with a thin binding plate 10 made of unvulcanized rubber. This rubber sheet is also designed so that it vulcanises comparatively quickly. This binding plate 10, which also compensates for the individual unevenness, is now provided with the fully vulcanized, profiled tread strip 11.

Es sei erwähnt, daß außer den plattenförmigen Binde- und Polstermitteln 7, 10 Auf- und Einstriche erfolgen können, um die Bindung zwischen den einzelnen Elementen zu beschleunigen und zu verbessern.It should be mentioned that in addition to the plate-shaped binding and cushioning means 7, 10 spreads and streaks can be made to accelerate and improve the bond between the individual elements.

Der so aufgebaute Reifen wird nunmehr mit einer Gummibandage versehen, zusätzlich jedoch noch auf eine Felge aufgesetzt und vor dem Einbringen in einen Autoklaven aufgepumpt.The tire thus constructed is now provided with a rubber bandage, but is additionally placed on a rim and inflated before being placed in an autoclave.

Durch die Behandlung im Autokalven wird die vorteilhafte Druckbehandlung vollzogen, gleichzeitig jedoch die zum Ausvulkanisieren erforderliche Temperatur zwischen 100 und 150°C erzeugt. Es ist nicht erforderlich, den gemäß Abbildung aufgebauten Reifenkörper mit einer besonders ihn umschließenden Stahlbandage zu versehen; die Festigkeitsträger der Gürtellagen 8 und 9 verändern ihre gewünschte Winkellage nicht, weil der sie umhüllende Gummi vor dem Auflegen der beiden Gürtellagen 8, 9 vulkanisiert worden war.The treatment in autoclaving achieves the advantageous pressure treatment, but at the same time generates the temperature between 100 and 150 ° C. required for vulcanization. It is not necessary to provide the tire body constructed according to the figure with a steel bandage which surrounds it in particular; the strength members of the belt layers 8 and 9 do not change their desired angular position because the rubber enveloping them had been vulcanized before the two belt layers 8, 9 were put on.

Das erfindungsgemäße Verfahren hat noch den großen Vorteil, daß die Behandlung im Autoklaven vergleichsweise schneller ausgeführt werden kann, weil der Gummi für die beiden Gürtellagen 8, 9 nicht mehr zu vulkaniseren war.The process according to the invention has the great advantage that the treatment in the autoclave can be carried out comparatively quickly because the rubber for the two belt layers 8, 9 was no longer too vulcanised.

Claims (3)

  1. Method of renewing tread strips and parts of belts of pneumatic vehicle tyres (1), the new belt ply (plies) (8, 9) being vulcanised prior to being placed in position, said ply (plies) (8, 9) being subsequently applied to the tyre body (1), optionally with the interposition of layers (7, 10) of bonding material and with the use of coatings, and then the ready vulcanised, profiled tread strip (11) is applied to said tyre body, and then a pressure treatment is optionally effected at a high temperature, whereby deformations and positional changes of the reinforcing members in the belt ply (plies) (8, 9) are excluded solely by the initial vulcanisation of the new belt ply (plies) (8, 9).
  2. Method according to claim 1, characterised in that the belt ply (plies) (8, 9) is (are) at least prevulcanised.
  3. Method according to claim 1, characterised in that the tyre body (1) is covered with a rapidly vulcanising, thin-walled bonding plate (7, 10) of rubber prior to the belt ply (plies) (8, 9) being placed in position.
EP88106805A 1987-06-04 1988-04-28 Method of recapping tyres Revoked EP0293599B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88106805T ATE86183T1 (en) 1987-06-04 1988-04-28 METHOD FOR REPLACING TREAD AND PARTIAL BELT OF VEHICLE PNEUMATIC TIRES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873718703 DE3718703A1 (en) 1987-06-04 1987-06-04 METHOD FOR REPLACING TREADMILLS AND SUBSTRATE PARTS FOR VEHICLE AIR TIRES
DE3718703 1987-06-04

Publications (3)

Publication Number Publication Date
EP0293599A2 EP0293599A2 (en) 1988-12-07
EP0293599A3 EP0293599A3 (en) 1990-09-12
EP0293599B1 true EP0293599B1 (en) 1993-03-03

Family

ID=6329035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106805A Revoked EP0293599B1 (en) 1987-06-04 1988-04-28 Method of recapping tyres

Country Status (4)

Country Link
EP (1) EP0293599B1 (en)
AT (1) ATE86183T1 (en)
DE (2) DE3718703A1 (en)
ES (1) ES2039008T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU38114A1 (en) * 1959-01-05
US4092196A (en) * 1976-03-22 1978-05-30 The Goodyear Tire & Rubber Company Retreading and rebuilding of radial tires
EP0047711A3 (en) * 1980-09-08 1984-07-25 The Goodyear Tire & Rubber Company Retreading and rebuilding of radial tires
IN165292B (en) * 1985-01-31 1989-09-09 Bandag Licensing Corp

Also Published As

Publication number Publication date
DE3878737D1 (en) 1993-04-08
ES2039008T3 (en) 1993-08-16
ATE86183T1 (en) 1993-03-15
DE3718703A1 (en) 1989-01-05
EP0293599A3 (en) 1990-09-12
EP0293599A2 (en) 1988-12-07

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